Three years after the Paris triathlon disaster, the center of the Capital is submerged, Sophia and Adil reunite for a high-risk mission: to track Lilith, the original predator, in the shark-infested Seine. There, they will discover that the deadly wildlife hides a much more surprising reality...

Michel Vaillant is # 1 of pilots, undisputed champion in rallying in all circuits in the world. His success arouses admiration and envy. Ruth Wong, director of Team Leader, is determined to break his streak and avenge the memory of his father, founder of Leader. She is capable of anything to achieve her goal.

Nicholas is the eldest son of a wealthy suburban family, whose businesswoman mother makes deals from a helicopter and has an affair with her business partner. His cheerful, alcoholic father, on the other hand, is reduced to a prisoner in his room with his devoted dog and electric train set. Unbeknownst to his parents, Nicholas works as a window cleaner and dish washer in a Parisian cafe. He is also in love with the daughter of another cafe's owner, who, however, has an abusive boyfriend. One night, Nicholas sneaks a few drunken drifters into his family wine cellar and his father unexpectedly takes a liking to the stranger.